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May 6, 2007 / milesandhisfavorites

Miles’s Science Encyclopedia Part Three


Now, I know you’ve always wondered what lived on the Earth before us.  So this article is going to be about creatures of long ago. 

 We should go back to the Triassic Period, about 220 million years ago.  It is the first period where dinosaurs first began to appear on Earth.  Dinosaurs including Coelophysis and Plateosaurus lived during this time.  Plus, creatures that weren’t dinosaurs lived at this time, including Cynognathus, a mammal-like reptile.

Whoosh!  Now, we’re in the Jurassic Period, 140 million years ago.  Creatures such as Allosaurus, which was a meat-eater, and Brachiosaurus, which was a plant-eater, lived at this time.  Dinosaurs got way bigger at this time.  In fact, the biggest dinosaurs were in a group called the Sauropods.  Sauropods includes  Camasaurus and Diplodocus. 

Whoosh! Now, finally we are in the Cretaceous Period, about 70 million years ago, the time of the world’s biggest dinosaur ever — Tyrannosaurus Rex! Man, this was a really really big guy.  In fact, its jaws were  home to 50 to 60 blade-like teeth.

This is a picture of a T-Rex fossil skeleton.  This was photographed at the Natural History Museum in New York City.  The workers who made this blog are in the picture at the base of the skeleton.

The dinosaurs became extinct 65 million years ago. 

Next time, we’re going to do another big dig — archeology! 


One Comment

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  1. Brandon / Nov 16 2007 4:15 pm

    Hi Miles! I just read that a paleontologist has discovered an interesting dinosaur with a mouth like a vacuum cleaner! You might like to read more about it:

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